Crosslimba is an experimental diy kalimba.
Two of those are mounted on a thin piece of plywood in a way, that tines can cross, so they rattle and bang!
The platform does have a stand-alone sound, however it is recommend to
1. Clamp it to a resonating surface, such as a can, table, drum or similar to give it more body and volume, and also
2. use a microphon, contact and/or air pressured (dynamic microphone is then to be prefered) to make it available for further amplification and/or processing.
Note, that material of tines obviously matters a lot. Spring steel, especially very thin, is recommended.
A variety of sticks and alternatively thumb playing also help the range of expression a lot.